package widget

import (
	"context"
	"fmt"
	"io"

	"git.ohea.xyz/cursorius/tui/queries"

	"github.com/Khan/genqlient/graphql"
	"github.com/charmbracelet/bubbles/list"
	"github.com/charmbracelet/bubbles/viewport"
	tea "github.com/charmbracelet/bubbletea"
)

type pipelineWidgetViewPage int

const (
	topLevel           pipelineWidgetViewPage = 0
	viewRun                                   = 1
	viewRunBuildOutput                        = 2
	viewRunStdout                             = 3
	viewRunStderr                             = 4
)

type pipelineWidgetView struct {
	client                  graphql.Client
	page                    pipelineWidgetViewPage
	pipeline                queries.GetPipelinePipeline
	runsList                list.Model
	viewRunSelector         list.Model
	viewRunBuildOutputPager viewport.Model
	viewRunStdoutPager      viewport.Model
	viewRunStderrPager      viewport.Model
}

func (m pipelineWidgetView) Init() tea.Cmd {
	return nil
}

func (m pipelineWidgetView) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
	switch msg := msg.(type) {
	case tea.WindowSizeMsg:
		m.runsList.SetWidth(msg.Width - 20)
		m.runsList.SetHeight(msg.Height - 20)
	case tea.KeyMsg:
		switch msg.String() {
		case "r":
			return m, func() tea.Msg {
				view, err := createPipelineWidgetView(m.client, m.pipeline.Id)
				if err != nil {
					return err
				}
				return pipelineWidgetScreenSwitch(view)
			}
		case "backspace":
			switch m.page {
			case topLevel:
				return m, func() tea.Msg {
					view, err := createPipelineWidgetList(m.client)
					if err != nil {
						return err
					}
					return pipelineWidgetScreenSwitch(view)
				}
			case viewRun:
				m.page = topLevel
			case viewRunBuildOutput:
				m.page = viewRun
			case viewRunStderr:
				m.page = viewRun
			case viewRunStdout:
				m.page = viewRun
			}
		case "enter":
			switch m.page {
			case topLevel:
				run := m.pipeline.Runs[m.runsList.Index()]

				content := []list.Item{
					pipelineWidgetViewRunsSelectorItem(fmt.Sprintf("ID: %v", run.Id)),
				}

				if run.InProgress != nil {
					content = append(content, pipelineWidgetViewRunsSelectorItem(fmt.Sprintf("In Progress: %v", *run.InProgress)))
				} else {
					content = append(content, pipelineWidgetViewRunsSelectorItem("In Progress: null"))
				}
				if run.Result != nil {
					content = append(content, pipelineWidgetViewRunsSelectorItem(fmt.Sprintf("Result: %v", *run.Result)))
				} else {
					content = append(content, pipelineWidgetViewRunsSelectorItem("Result: null"))
				}
				content = append(content, pipelineWidgetViewRunsSelectorItem("View Build Output"))
				content = append(content, pipelineWidgetViewRunsSelectorItem("View Stdout"))
				content = append(content, pipelineWidgetViewRunsSelectorItem("View Stderr"))

				runOutputList := list.New(content, pipelineWigetViewRunsSelectorItemDelegate{}, m.runsList.Width(), m.runsList.Height())
				runOutputList.SetShowStatusBar(false)
				runOutputList.Title = "View Run"
				runOutputList.DisableQuitKeybindings()

				m.viewRunSelector = runOutputList

				m.page = viewRun
			case viewRun:
				run := m.pipeline.Runs[m.runsList.Index()]
				switch m.viewRunSelector.Index() {
				case 3:
					if run.BuildOutput == nil {
						break
					}
					m.viewRunBuildOutputPager = viewport.New(m.runsList.Width(), m.runsList.Height())
					m.viewRunBuildOutputPager.SetContent(*run.BuildOutput)
					m.page = viewRunBuildOutput
				case 4:
					if run.Stdout == nil {
						break
					}
					m.viewRunStdoutPager = viewport.New(m.runsList.Width(), m.runsList.Height())
					m.viewRunStdoutPager.SetContent(*run.Stdout)

					m.page = viewRunStdout
				case 5:
					if run.Stderr == nil {
						break
					}
					m.viewRunStderrPager = viewport.New(m.runsList.Width(), m.runsList.Height())
					m.viewRunStderrPager.SetContent(*run.Stderr)

					m.page = viewRunStderr
				}
			}

		}
	}

	var cmd tea.Cmd
	switch m.page {
	case topLevel:
		m.runsList, cmd = m.runsList.Update(msg)
	case viewRun:
		m.viewRunSelector, cmd = m.viewRunSelector.Update(msg)
	case viewRunBuildOutput:
		m.viewRunBuildOutputPager, cmd = m.viewRunBuildOutputPager.Update(msg)
	case viewRunStdout:
		m.viewRunStdoutPager, cmd = m.viewRunStdoutPager.Update(msg)
	case viewRunStderr:
		m.viewRunStderrPager, cmd = m.viewRunStderrPager.Update(msg)
	}

	return m, cmd
}

func (m pipelineWidgetView) View() string {
	s := ""
	switch m.page {
	case topLevel:
		s += fmt.Sprintf("Pipeline: %v\n\n", m.pipeline.Name)
		s += fmt.Sprintf("Id: %v\n", m.pipeline.Id)
		s += fmt.Sprintf("Url: %v\n", m.pipeline.Url)
		s += fmt.Sprintf("Poll Interval: %v\n", m.pipeline.PollInterval)
		if m.pipeline.CloneCredential != nil {
			s += fmt.Sprintf("Clone Credential: %v (%v)\n\n", m.pipeline.CloneCredential.Name, m.pipeline.CloneCredential.Type)
		} else {
			s += fmt.Sprintf("Clone Credential: None\n\n")
		}
		s += m.runsList.View()
	case viewRun:
		s += m.viewRunSelector.View()
	case viewRunBuildOutput:
		s += m.viewRunBuildOutputPager.View()
	case viewRunStdout:
		s += m.viewRunStdoutPager.View()
	case viewRunStderr:
		s += m.viewRunStderrPager.View()

	}
	return s
}

func createPipelineWidgetView(client graphql.Client, id string) (tea.Model, error) {

	getPipelineResp, err := queries.GetPipeline(context.Background(), client, id)
	if err != nil {
		return nil, err
	}

	if getPipelineResp.Pipeline == nil {
		return nil, fmt.Errorf("Server did not give us a pipeline")
	}

	var content []list.Item

	for _, run := range getPipelineResp.Pipeline.Runs {
		content = append(content, pipelineWidgetViewRunsItem{
			id: run.Id,
		})
	}

	runsList := list.New(content, pipelineWigetViewRunsItemDelegate{}, 0, 0)
	runsList.SetShowStatusBar(false)
	runsList.Title = "Runs"

	return pipelineWidgetView{
		client:   client,
		page:     topLevel,
		pipeline: *getPipelineResp.Pipeline,
		runsList: runsList,
	}, nil
}

type pipelineWidgetViewRunsItem struct {
	id string
}

func (i pipelineWidgetViewRunsItem) FilterValue() string { return "" }

type pipelineWigetViewRunsItemDelegate struct{}

func (d pipelineWigetViewRunsItemDelegate) Height() int                               { return 1 }
func (d pipelineWigetViewRunsItemDelegate) Spacing() int                              { return 0 }
func (d pipelineWigetViewRunsItemDelegate) Update(msg tea.Msg, m *list.Model) tea.Cmd { return nil }
func (d pipelineWigetViewRunsItemDelegate) Render(w io.Writer, m list.Model, index int, listItem list.Item) {
	switch i := listItem.(type) {
	case pipelineWidgetViewRunsItem:
		fn := itemStyle.Render
		if index == m.Index() {
			fn = func(s string) string {
				return selectedItemStyle.Render("> " + s)
			}
		}

		str := fn(i.id)
		fmt.Fprint(w, str)
	}
}

type pipelineWidgetViewRunsSelectorItem string

func (i pipelineWidgetViewRunsSelectorItem) FilterValue() string { return "" }

type pipelineWigetViewRunsSelectorItemDelegate struct{}

func (d pipelineWigetViewRunsSelectorItemDelegate) Height() int  { return 1 }
func (d pipelineWigetViewRunsSelectorItemDelegate) Spacing() int { return 0 }
func (d pipelineWigetViewRunsSelectorItemDelegate) Update(msg tea.Msg, m *list.Model) tea.Cmd {
	return nil
}
func (d pipelineWigetViewRunsSelectorItemDelegate) Render(w io.Writer, m list.Model, index int, listItem list.Item) {
	switch i := listItem.(type) {
	case pipelineWidgetViewRunsSelectorItem:
		fn := itemStyle.Render
		if index == m.Index() {
			fn = func(s string) string {
				return selectedItemStyle.Render("> " + s)
			}
		}

		str := fn(string(i))
		fmt.Fprint(w, str)
	}
}